headers: Fix headers across the project

Any word started with underscore followed by and uppercase letter or a
second underscore is a reserved word according with C99.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>

include/linker/linker-defs.h

@@ -16,8 +16,8 @@
  *   section
  */
 
-#ifndef _LINKERDEFS_H
-#define _LINKERDEFS_H
+#ifndef ZEPHYR_INCLUDE_LINKER_LINKER_DEFS_H_
+#define ZEPHYR_INCLUDE_LINKER_LINKER_DEFS_H_
 
 #include <toolchain.h>
 #include <linker/sections.h>
@@ -272,4 +272,4 @@ extern char __sg_size[];
 
 #endif /* ! _ASMLANGUAGE */
 
-#endif /* _LINKERDEFS_H */
+#endif /* ZEPHYR_INCLUDE_LINKER_LINKER_DEFS_H_ */

include/linker/linker-tool-gcc.h

@@ -12,8 +12,8 @@
  * use with the GCC linker.
  */
 
-#ifndef __LINKER_TOOL_GCC_H
-#define __LINKER_TOOL_GCC_H
+#ifndef ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_GCC_H_
+#define ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_GCC_H_
 
 #if defined(CONFIG_ARM)
 	OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
@@ -121,4 +121,4 @@
 
 #define COMMON_SYMBOLS *(COMMON)
 
-#endif /* !__LINKER_TOOL_GCC_H */
+#endif /* ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_GCC_H_ */

include/linker/linker-tool.h

@@ -12,8 +12,8 @@
  * definitions (based on the toolchain) for the linker script.
  */
 
-#ifndef __LINKER_TOOL_H
-#define __LINKER_TOOL_H
+#ifndef ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_H_
+#define ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_H_
 
 #if defined(_LINKER)
 #if defined(__GCC_LINKER_CMD__)
@@ -23,4 +23,4 @@
 #endif
 #endif
 
-#endif /* !__LINKER_TOOL_H */
+#endif /* ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_H_ */

include/linker/section_tags.h

@@ -6,8 +6,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#ifndef _section_tags__h_
-#define _section_tags__h_
+#ifndef ZEPHYR_INCLUDE_LINKER_SECTION_TAGS_H_
+#define ZEPHYR_INCLUDE_LINKER_SECTION_TAGS_H_
 
 #include <toolchain.h>
 
@@ -27,4 +27,4 @@
 
 #endif /* !_ASMLANGUAGE */
 
-#endif /* _section_tags__h_ */
+#endif /* ZEPHYR_INCLUDE_LINKER_SECTION_TAGS_H_ */

include/linker/sections.h

@@ -12,8 +12,8 @@
  * files.
  */
 
-#ifndef _SECTIONS_H
-#define _SECTIONS_H
+#ifndef ZEPHYR_INCLUDE_LINKER_SECTIONS_H_
+#define ZEPHYR_INCLUDE_LINKER_SECTIONS_H_
 
 #define _TEXT_SECTION_NAME text
 #define _RODATA_SECTION_NAME rodata
@@ -61,4 +61,4 @@
 
 #include <linker/section_tags.h>
 
-#endif /* _SECTIONS_H */
+#endif /* ZEPHYR_INCLUDE_LINKER_SECTIONS_H_ */